Keystones — Capstone
Five GCSE retrieval questions · 27 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: x² + 11x - 1
Answer: (x + 11⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 21cm, angle = 44°. Give your answer to 2 decimal places
Answer: 182.35cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 24:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 38, 21, 25, 34, 50, 28, 32
Answer: Mean = 35.5, Median = 33, Range = 35